Update openpyxl requirement from ==3.0.* to ==3.1.*

[dependabot[bot]]

Updates the requirements on openpyxl to permit the latest version.

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[stefanb]

@dependabot recreate

[stefanb]

@dependabot rebase

[stefanb]

@dependabot rebase

[stefanb]

@dependabot rebase

[stefanb]

@dependabot rebase